If x=4, calculate the value of: x2 + 2x

Veda solves the following system of linear equations by elimination. What is the value of x of the solution?

A roller coaster holds up to 6 people per ride. there are 15 adult and 9 children standing in line. how many times will the roller coaster need to be run for everyone standing in line to have a ride?

A basket holds n apples. You pick 2n-3 apples, and your friend picks n+4 apples. Write an expression that represents the number of apples you and your friend picked. Interpret the expression.

What times what equals 200.

Solve the equation 3/4=y-1/5 (8) y=

When a bottle too will flipped lands either face up or face down. in an experiment the following results are obtained after 50flips:face up 31times and face down 19times.

Write as a fraction in lowest terms: 0.126126125 = a/b

Find the average rate of change for f (x) = x2 - 8x + 15 from x = 0 to x = 4. A) - 2 B) - 4 C) 2 D) 4

If one gallon of gas costs $3.50 how much would 3,5, and 7 gallons cost?

to mail a cardboard box, you measure its size and mass. It is 55cm long, 25cm wide and 20 cm high. The mass of the box is 4kg. What is the density of the boxes in grams over cm squared